Explosion-Proof Heaters: Certified Thermal Safety for Hazardous Zones
Explosion-Proof Heaters: Certified Thermal Safety for Hazardous Zones
| Technical Specs | Range / Typical Values |
| Certification | Built to ATEX / IECEx / UL standards |
| Enclosure | Cast Aluminum or Stainless Steel |
| Current | 10A – 200A+ |
| Temp Class | T1 – T6 (Based on gas ignition temp) |
Flame-Proof Enclosures: Equipped with cast aluminum or heavy-wall steel “NEMA 7” or “NEMA 9” terminal housings. These enclosures feature precision-ground “flame paths” that cool internal combustion gases before they can exit the box.
T-Code (Temperature Class) Compliance: Designed to maintain low sheath temperatures to ensure the heater surface never exceeds the “Auto-Ignition Temperature” (AIT) of the specific gases or dusts in the environment (e.g., T3, T4, or T6 ratings).
Hermetic Element Sealing: Elements are typically sealed with specialized epoxy or ceramic-to-metal seals to prevent the ingress of moisture or flammable vapors into the heating core.
Redundant Safety Systems: Standard configurations include high-limit thermocouples and fail-safe thermal cutouts to automatically disconnect power if airflow or liquid levels drop.
| Feature | Gas & Vapor (Class I) | Combustible Dust (Class II) |
| Typical Groups | Group B (Hydrogen), C, D | Group E (Metal), F (Coal), G (Grain) |
| Terminal Box | NEMA 7 (Explosion-Proof) | NEMA 9 (Dust-Ignition Proof) |
| Certification Standards | ATEX, IECEx, UL, CSA | ATEX, IECEx, UL, CSA |
| Common Designs | Convection, Immersion, Duct | Space Heaters, Tank Heaters |
Oil & Gas Refineries: Heating of volatile crude derivatives and fuel storage tanks.
Chemical Processing: Providing thermal energy for reactors and distillation columns involving flammable solvents.
Paint & Coating Booths: Curing and drying in environments with high concentrations of VOCs (Volatile Organic Compounds).
Mining & Grain Handling: Space heating in areas with high coal or flour dust concentrations.
Hydrogen Storage: Specialized heating for the emerging green hydrogen infrastructure.
Safety Warning: Explosion-proof ratings are only valid if the installation follows strict “Seal-Off” procedures. All conduit entries must be packed with approved sealing compound to prevent gases from traveling through the electrical piping system.
For critical industrial processes, a heating element is only as good as its durability and control. At Runkel, we specialize in high-spec thermal engineering. From high-vacuum environments to hazardous explosion-proof zones, we provide fully customized heaters integrated with bespoke Control Cabinets for a true “plug-and-play” experience.
The Total Solution: Integrated Control Cabinets. We don’t just provide the heat; we provide the brain. To ensure your heating system operates safely and accurately, we offer Custom-Built Control Cabinets tailored to your specific heater:Precise Control: PID or PLC-based systems for temperature accuracy within $\pm 1$°C.Safety First: Integrated over-temperature protection, leakage circuit breakers, and emergency stops.User Interface: Digital displays, HMI touchscreens, or remote monitoring capabilities.Custom Voltage: Built to match your local industrial power standards (e.g., 220V, 380V, 440V, or 480V).
“Complex Requirements, Simple Execution.”
Direct Replacement of Legacy Parts:
If your imported equipment has a failed flanged heater or a specialized vacuum element that is too expensive or slow to source from the OEM, we can reverse-engineer and manufacture a replacement that meets or exceeds the original specs.
Material Excellence:
We select materials based on your environment—whether it’s Incoloy 800 for high-temperature oxidation or Pure PTFE for chemical longevity.
Start Your Custom Build Today
Whether you need a replacement Defrost Heater for a cold storage unit or a complete Explosion-Proof Circulation System with a control panel, we are ready to assist.